sql-server - 带有 IF 逻辑的 T-SQL 不适用于临时表

Question

IF OBJECT_ID('tempdb..#iftry') IS NOT NULL 
DROP TABLE #iftry

IF OBJECT_ID('BIC_Analytics.dbo.AdjudicateAllDCCharteredClaims') IS  NULL
begin
select 'this is start of first block'
 SELECT 'this is first block' as blockid
 INTO #iftry
select 'this is end of first block'
end

ELSE

begin
select 'this is start of 2nd block'
 SELECT 'this is 2nd block' as blockid
    INTO #iftry
select 'this is end of 2nd block'
end

select ':)'

select * from #iftry

不断给我错误：

Msg 2714, Level 16, State 1, Line 18
There is already an object named '#iftry' in the database.

现在它可以工作了

IF OBJECT_ID('tempdb..#iftry') IS NOT NULL 
DROP TABLE #iftry

create table #iftry (blockid varchar(20))


IF OBJECT_ID('BIC_Analytics.dbo.AdjudicateAllDCCharteredClaims') IS NOT NULL
begin
--select 'this is start of first block'
 insert into #iftry (blockid)
 select 'this is first block' 
--select 'this is end of first block'
end

ELSE

begin
--select 'this is start of 2nd block'
 insert into #iftry (blockid)
 select 'this is 2nd block' 
--select 'this is end of 2nd block'
end

select ':)'

select * from #iftry

Answer 1

这是一个解析问题，而不是运行时问题。SQL Server 看不到有两个无法访问的代码路径。

要解决此问题，请预先创建 #temp 表：

SELECT 'bogus' INTO #iftry
  WHERE 1 = 0; -- creates empty table

IF ...
  INSERT #iftry ...
ELSE ...
  INSERT #iftry ...

没有办法告诉 SQL Server 不要以这种方式工作，除非您将两个 #table 声明放在不同的批次中（您实际上不能这样做），或者构建动态 SQL 并在该范围内使用 #temp 表（不好玩）。